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Copy pathhid-logitech-hidpp.c
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hid-logitech-hidpp.c
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/*
* HIDPP protocol for Logitech Unifying receivers
*
* Copyright (c) 2011 Logitech (c)
* Copyright (c) 2012-2013 Google (c)
* Copyright (c) 2013-2014 Red Hat Inc.
*/
/*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; version 2 of the License.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/device.h>
#include <linux/input.h>
#include <linux/usb.h>
#include <linux/hid.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/kfifo.h>
#include <linux/input/mt.h>
#include <linux/workqueue.h>
#include <linux/atomic.h>
#include <linux/fixp-arith.h>
#include <asm/unaligned.h>
#include "usbhid/usbhid.h"
#include "hid-ids.h"
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Benjamin Tissoires <[email protected]>");
MODULE_AUTHOR("Nestor Lopez Casado <[email protected]>");
static bool disable_raw_mode;
module_param(disable_raw_mode, bool, 0644);
MODULE_PARM_DESC(disable_raw_mode,
"Disable Raw mode reporting for touchpads and keep firmware gestures.");
static bool disable_tap_to_click;
module_param(disable_tap_to_click, bool, 0644);
MODULE_PARM_DESC(disable_tap_to_click,
"Disable Tap-To-Click mode reporting for touchpads (only on the K400 currently).");
#define REPORT_ID_HIDPP_SHORT 0x10
#define REPORT_ID_HIDPP_LONG 0x11
#define REPORT_ID_HIDPP_VERY_LONG 0x12
#define HIDPP_REPORT_SHORT_LENGTH 7
#define HIDPP_REPORT_LONG_LENGTH 20
#define HIDPP_REPORT_VERY_LONG_LENGTH 64
#define HIDPP_QUIRK_CLASS_WTP BIT(0)
#define HIDPP_QUIRK_CLASS_M560 BIT(1)
#define HIDPP_QUIRK_CLASS_K400 BIT(2)
#define HIDPP_QUIRK_CLASS_G920 BIT(3)
/* bits 2..20 are reserved for classes */
#define HIDPP_QUIRK_CONNECT_EVENTS BIT(21)
#define HIDPP_QUIRK_WTP_PHYSICAL_BUTTONS BIT(22)
#define HIDPP_QUIRK_NO_HIDINPUT BIT(23)
#define HIDPP_QUIRK_FORCE_OUTPUT_REPORTS BIT(24)
#define HIDPP_QUIRK_DELAYED_INIT (HIDPP_QUIRK_NO_HIDINPUT | \
HIDPP_QUIRK_CONNECT_EVENTS)
/*
* There are two hidpp protocols in use, the first version hidpp10 is known
* as register access protocol or RAP, the second version hidpp20 is known as
* feature access protocol or FAP
*
* Most older devices (including the Unifying usb receiver) use the RAP protocol
* where as most newer devices use the FAP protocol. Both protocols are
* compatible with the underlying transport, which could be usb, Unifiying, or
* bluetooth. The message lengths are defined by the hid vendor specific report
* descriptor for the HIDPP_SHORT report type (total message lenth 7 bytes) and
* the HIDPP_LONG report type (total message length 20 bytes)
*
* The RAP protocol uses both report types, whereas the FAP only uses HIDPP_LONG
* messages. The Unifying receiver itself responds to RAP messages (device index
* is 0xFF for the receiver), and all messages (short or long) with a device
* index between 1 and 6 are passed untouched to the corresponding paired
* Unifying device.
*
* The paired device can be RAP or FAP, it will receive the message untouched
* from the Unifiying receiver.
*/
struct fap {
u8 feature_index;
u8 funcindex_clientid;
u8 params[HIDPP_REPORT_VERY_LONG_LENGTH - 4U];
};
struct rap {
u8 sub_id;
u8 reg_address;
u8 params[HIDPP_REPORT_VERY_LONG_LENGTH - 4U];
};
struct hidpp_report {
u8 report_id;
u8 device_index;
union {
struct fap fap;
struct rap rap;
u8 rawbytes[sizeof(struct fap)];
};
} __packed;
struct hidpp_device {
struct hid_device *hid_dev;
struct mutex send_mutex;
void *send_receive_buf;
char *name; /* will never be NULL and should not be freed */
wait_queue_head_t wait;
bool answer_available;
u8 protocol_major;
u8 protocol_minor;
void *private_data;
struct work_struct work;
struct kfifo delayed_work_fifo;
atomic_t connected;
struct input_dev *delayed_input;
unsigned long quirks;
};
/* HID++ 1.0 error codes */
#define HIDPP_ERROR 0x8f
#define HIDPP_ERROR_SUCCESS 0x00
#define HIDPP_ERROR_INVALID_SUBID 0x01
#define HIDPP_ERROR_INVALID_ADRESS 0x02
#define HIDPP_ERROR_INVALID_VALUE 0x03
#define HIDPP_ERROR_CONNECT_FAIL 0x04
#define HIDPP_ERROR_TOO_MANY_DEVICES 0x05
#define HIDPP_ERROR_ALREADY_EXISTS 0x06
#define HIDPP_ERROR_BUSY 0x07
#define HIDPP_ERROR_UNKNOWN_DEVICE 0x08
#define HIDPP_ERROR_RESOURCE_ERROR 0x09
#define HIDPP_ERROR_REQUEST_UNAVAILABLE 0x0a
#define HIDPP_ERROR_INVALID_PARAM_VALUE 0x0b
#define HIDPP_ERROR_WRONG_PIN_CODE 0x0c
/* HID++ 2.0 error codes */
#define HIDPP20_ERROR 0xff
static void hidpp_connect_event(struct hidpp_device *hidpp_dev);
static int __hidpp_send_report(struct hid_device *hdev,
struct hidpp_report *hidpp_report)
{
struct hidpp_device *hidpp = hid_get_drvdata(hdev);
int fields_count, ret;
hidpp = hid_get_drvdata(hdev);
switch (hidpp_report->report_id) {
case REPORT_ID_HIDPP_SHORT:
fields_count = HIDPP_REPORT_SHORT_LENGTH;
break;
case REPORT_ID_HIDPP_LONG:
fields_count = HIDPP_REPORT_LONG_LENGTH;
break;
case REPORT_ID_HIDPP_VERY_LONG:
fields_count = HIDPP_REPORT_VERY_LONG_LENGTH;
break;
default:
return -ENODEV;
}
/*
* set the device_index as the receiver, it will be overwritten by
* hid_hw_request if needed
*/
hidpp_report->device_index = 0xff;
if (hidpp->quirks & HIDPP_QUIRK_FORCE_OUTPUT_REPORTS) {
ret = hid_hw_output_report(hdev, (u8 *)hidpp_report, fields_count);
} else {
ret = hid_hw_raw_request(hdev, hidpp_report->report_id,
(u8 *)hidpp_report, fields_count, HID_OUTPUT_REPORT,
HID_REQ_SET_REPORT);
}
return ret == fields_count ? 0 : -1;
}
/**
* hidpp_send_message_sync() returns 0 in case of success, and something else
* in case of a failure.
* - If ' something else' is positive, that means that an error has been raised
* by the protocol itself.
* - If ' something else' is negative, that means that we had a classic error
* (-ENOMEM, -EPIPE, etc...)
*/
static int hidpp_send_message_sync(struct hidpp_device *hidpp,
struct hidpp_report *message,
struct hidpp_report *response)
{
int ret;
mutex_lock(&hidpp->send_mutex);
hidpp->send_receive_buf = response;
hidpp->answer_available = false;
/*
* So that we can later validate the answer when it arrives
* in hidpp_raw_event
*/
*response = *message;
ret = __hidpp_send_report(hidpp->hid_dev, message);
if (ret) {
dbg_hid("__hidpp_send_report returned err: %d\n", ret);
memset(response, 0, sizeof(struct hidpp_report));
goto exit;
}
if (!wait_event_timeout(hidpp->wait, hidpp->answer_available,
5*HZ)) {
dbg_hid("%s:timeout waiting for response\n", __func__);
memset(response, 0, sizeof(struct hidpp_report));
ret = -ETIMEDOUT;
}
if (response->report_id == REPORT_ID_HIDPP_SHORT &&
response->rap.sub_id == HIDPP_ERROR) {
ret = response->rap.params[1];
dbg_hid("%s:got hidpp error %02X\n", __func__, ret);
goto exit;
}
if ((response->report_id == REPORT_ID_HIDPP_LONG ||
response->report_id == REPORT_ID_HIDPP_VERY_LONG) &&
response->fap.feature_index == HIDPP20_ERROR) {
ret = response->fap.params[1];
dbg_hid("%s:got hidpp 2.0 error %02X\n", __func__, ret);
goto exit;
}
exit:
mutex_unlock(&hidpp->send_mutex);
return ret;
}
static int hidpp_send_fap_command_sync(struct hidpp_device *hidpp,
u8 feat_index, u8 funcindex_clientid, u8 *params, int param_count,
struct hidpp_report *response)
{
struct hidpp_report *message;
int ret;
if (param_count > sizeof(message->fap.params))
return -EINVAL;
message = kzalloc(sizeof(struct hidpp_report), GFP_KERNEL);
if (!message)
return -ENOMEM;
if (param_count > (HIDPP_REPORT_LONG_LENGTH - 4))
message->report_id = REPORT_ID_HIDPP_VERY_LONG;
else
message->report_id = REPORT_ID_HIDPP_LONG;
message->fap.feature_index = feat_index;
message->fap.funcindex_clientid = funcindex_clientid;
memcpy(&message->fap.params, params, param_count);
ret = hidpp_send_message_sync(hidpp, message, response);
kfree(message);
return ret;
}
static int hidpp_send_rap_command_sync(struct hidpp_device *hidpp_dev,
u8 report_id, u8 sub_id, u8 reg_address, u8 *params, int param_count,
struct hidpp_report *response)
{
struct hidpp_report *message;
int ret, max_count;
switch (report_id) {
case REPORT_ID_HIDPP_SHORT:
max_count = HIDPP_REPORT_SHORT_LENGTH - 4;
break;
case REPORT_ID_HIDPP_LONG:
max_count = HIDPP_REPORT_LONG_LENGTH - 4;
break;
case REPORT_ID_HIDPP_VERY_LONG:
max_count = HIDPP_REPORT_VERY_LONG_LENGTH - 4;
break;
default:
return -EINVAL;
}
if (param_count > max_count)
return -EINVAL;
message = kzalloc(sizeof(struct hidpp_report), GFP_KERNEL);
if (!message)
return -ENOMEM;
message->report_id = report_id;
message->rap.sub_id = sub_id;
message->rap.reg_address = reg_address;
memcpy(&message->rap.params, params, param_count);
ret = hidpp_send_message_sync(hidpp_dev, message, response);
kfree(message);
return ret;
}
static void delayed_work_cb(struct work_struct *work)
{
struct hidpp_device *hidpp = container_of(work, struct hidpp_device,
work);
hidpp_connect_event(hidpp);
}
static inline bool hidpp_match_answer(struct hidpp_report *question,
struct hidpp_report *answer)
{
return (answer->fap.feature_index == question->fap.feature_index) &&
(answer->fap.funcindex_clientid == question->fap.funcindex_clientid);
}
static inline bool hidpp_match_error(struct hidpp_report *question,
struct hidpp_report *answer)
{
return ((answer->rap.sub_id == HIDPP_ERROR) ||
(answer->fap.feature_index == HIDPP20_ERROR)) &&
(answer->fap.funcindex_clientid == question->fap.feature_index) &&
(answer->fap.params[0] == question->fap.funcindex_clientid);
}
static inline bool hidpp_report_is_connect_event(struct hidpp_report *report)
{
return (report->report_id == REPORT_ID_HIDPP_SHORT) &&
(report->rap.sub_id == 0x41);
}
/**
* hidpp_prefix_name() prefixes the current given name with "Logitech ".
*/
static void hidpp_prefix_name(char **name, int name_length)
{
#define PREFIX_LENGTH 9 /* "Logitech " */
int new_length;
char *new_name;
if (name_length > PREFIX_LENGTH &&
strncmp(*name, "Logitech ", PREFIX_LENGTH) == 0)
/* The prefix has is already in the name */
return;
new_length = PREFIX_LENGTH + name_length;
new_name = kzalloc(new_length, GFP_KERNEL);
if (!new_name)
return;
snprintf(new_name, new_length, "Logitech %s", *name);
kfree(*name);
*name = new_name;
}
/* -------------------------------------------------------------------------- */
/* HIDP++ 1.0 commands */
/* -------------------------------------------------------------------------- */
#define HIDPP_SET_REGISTER 0x80
#define HIDPP_GET_REGISTER 0x81
#define HIDPP_SET_LONG_REGISTER 0x82
#define HIDPP_GET_LONG_REGISTER 0x83
#define HIDPP_REG_PAIRING_INFORMATION 0xB5
#define DEVICE_NAME 0x40
static char *hidpp_get_unifying_name(struct hidpp_device *hidpp_dev)
{
struct hidpp_report response;
int ret;
/* hid-logitech-dj is in charge of setting the right device index */
u8 params[1] = { DEVICE_NAME };
char *name;
int len;
ret = hidpp_send_rap_command_sync(hidpp_dev,
REPORT_ID_HIDPP_SHORT,
HIDPP_GET_LONG_REGISTER,
HIDPP_REG_PAIRING_INFORMATION,
params, 1, &response);
if (ret)
return NULL;
len = response.rap.params[1];
if (2 + len > sizeof(response.rap.params))
return NULL;
name = kzalloc(len + 1, GFP_KERNEL);
if (!name)
return NULL;
memcpy(name, &response.rap.params[2], len);
/* include the terminating '\0' */
hidpp_prefix_name(&name, len + 1);
return name;
}
/* -------------------------------------------------------------------------- */
/* 0x0000: Root */
/* -------------------------------------------------------------------------- */
#define HIDPP_PAGE_ROOT 0x0000
#define HIDPP_PAGE_ROOT_IDX 0x00
#define CMD_ROOT_GET_FEATURE 0x01
#define CMD_ROOT_GET_PROTOCOL_VERSION 0x11
static int hidpp_root_get_feature(struct hidpp_device *hidpp, u16 feature,
u8 *feature_index, u8 *feature_type)
{
struct hidpp_report response;
int ret;
u8 params[2] = { feature >> 8, feature & 0x00FF };
ret = hidpp_send_fap_command_sync(hidpp,
HIDPP_PAGE_ROOT_IDX,
CMD_ROOT_GET_FEATURE,
params, 2, &response);
if (ret)
return ret;
*feature_index = response.fap.params[0];
*feature_type = response.fap.params[1];
return ret;
}
static int hidpp_root_get_protocol_version(struct hidpp_device *hidpp)
{
struct hidpp_report response;
int ret;
ret = hidpp_send_fap_command_sync(hidpp,
HIDPP_PAGE_ROOT_IDX,
CMD_ROOT_GET_PROTOCOL_VERSION,
NULL, 0, &response);
if (ret == HIDPP_ERROR_INVALID_SUBID) {
hidpp->protocol_major = 1;
hidpp->protocol_minor = 0;
return 0;
}
/* the device might not be connected */
if (ret == HIDPP_ERROR_RESOURCE_ERROR)
return -EIO;
if (ret > 0) {
hid_err(hidpp->hid_dev, "%s: received protocol error 0x%02x\n",
__func__, ret);
return -EPROTO;
}
if (ret)
return ret;
hidpp->protocol_major = response.fap.params[0];
hidpp->protocol_minor = response.fap.params[1];
return ret;
}
static bool hidpp_is_connected(struct hidpp_device *hidpp)
{
int ret;
ret = hidpp_root_get_protocol_version(hidpp);
if (!ret)
hid_dbg(hidpp->hid_dev, "HID++ %u.%u device connected.\n",
hidpp->protocol_major, hidpp->protocol_minor);
return ret == 0;
}
/* -------------------------------------------------------------------------- */
/* 0x0005: GetDeviceNameType */
/* -------------------------------------------------------------------------- */
#define HIDPP_PAGE_GET_DEVICE_NAME_TYPE 0x0005
#define CMD_GET_DEVICE_NAME_TYPE_GET_COUNT 0x01
#define CMD_GET_DEVICE_NAME_TYPE_GET_DEVICE_NAME 0x11
#define CMD_GET_DEVICE_NAME_TYPE_GET_TYPE 0x21
static int hidpp_devicenametype_get_count(struct hidpp_device *hidpp,
u8 feature_index, u8 *nameLength)
{
struct hidpp_report response;
int ret;
ret = hidpp_send_fap_command_sync(hidpp, feature_index,
CMD_GET_DEVICE_NAME_TYPE_GET_COUNT, NULL, 0, &response);
if (ret > 0) {
hid_err(hidpp->hid_dev, "%s: received protocol error 0x%02x\n",
__func__, ret);
return -EPROTO;
}
if (ret)
return ret;
*nameLength = response.fap.params[0];
return ret;
}
static int hidpp_devicenametype_get_device_name(struct hidpp_device *hidpp,
u8 feature_index, u8 char_index, char *device_name, int len_buf)
{
struct hidpp_report response;
int ret, i;
int count;
ret = hidpp_send_fap_command_sync(hidpp, feature_index,
CMD_GET_DEVICE_NAME_TYPE_GET_DEVICE_NAME, &char_index, 1,
&response);
if (ret > 0) {
hid_err(hidpp->hid_dev, "%s: received protocol error 0x%02x\n",
__func__, ret);
return -EPROTO;
}
if (ret)
return ret;
switch (response.report_id) {
case REPORT_ID_HIDPP_VERY_LONG:
count = HIDPP_REPORT_VERY_LONG_LENGTH - 4;
break;
case REPORT_ID_HIDPP_LONG:
count = HIDPP_REPORT_LONG_LENGTH - 4;
break;
case REPORT_ID_HIDPP_SHORT:
count = HIDPP_REPORT_SHORT_LENGTH - 4;
break;
default:
return -EPROTO;
}
if (len_buf < count)
count = len_buf;
for (i = 0; i < count; i++)
device_name[i] = response.fap.params[i];
return count;
}
static char *hidpp_get_device_name(struct hidpp_device *hidpp)
{
u8 feature_type;
u8 feature_index;
u8 __name_length;
char *name;
unsigned index = 0;
int ret;
ret = hidpp_root_get_feature(hidpp, HIDPP_PAGE_GET_DEVICE_NAME_TYPE,
&feature_index, &feature_type);
if (ret)
return NULL;
ret = hidpp_devicenametype_get_count(hidpp, feature_index,
&__name_length);
if (ret)
return NULL;
name = kzalloc(__name_length + 1, GFP_KERNEL);
if (!name)
return NULL;
while (index < __name_length) {
ret = hidpp_devicenametype_get_device_name(hidpp,
feature_index, index, name + index,
__name_length - index);
if (ret <= 0) {
kfree(name);
return NULL;
}
index += ret;
}
/* include the terminating '\0' */
hidpp_prefix_name(&name, __name_length + 1);
return name;
}
/* -------------------------------------------------------------------------- */
/* 0x6010: Touchpad FW items */
/* -------------------------------------------------------------------------- */
#define HIDPP_PAGE_TOUCHPAD_FW_ITEMS 0x6010
#define CMD_TOUCHPAD_FW_ITEMS_SET 0x10
struct hidpp_touchpad_fw_items {
uint8_t presence;
uint8_t desired_state;
uint8_t state;
uint8_t persistent;
};
/**
* send a set state command to the device by reading the current items->state
* field. items is then filled with the current state.
*/
static int hidpp_touchpad_fw_items_set(struct hidpp_device *hidpp,
u8 feature_index,
struct hidpp_touchpad_fw_items *items)
{
struct hidpp_report response;
int ret;
u8 *params = (u8 *)response.fap.params;
ret = hidpp_send_fap_command_sync(hidpp, feature_index,
CMD_TOUCHPAD_FW_ITEMS_SET, &items->state, 1, &response);
if (ret > 0) {
hid_err(hidpp->hid_dev, "%s: received protocol error 0x%02x\n",
__func__, ret);
return -EPROTO;
}
if (ret)
return ret;
items->presence = params[0];
items->desired_state = params[1];
items->state = params[2];
items->persistent = params[3];
return 0;
}
/* -------------------------------------------------------------------------- */
/* 0x6100: TouchPadRawXY */
/* -------------------------------------------------------------------------- */
#define HIDPP_PAGE_TOUCHPAD_RAW_XY 0x6100
#define CMD_TOUCHPAD_GET_RAW_INFO 0x01
#define CMD_TOUCHPAD_SET_RAW_REPORT_STATE 0x21
#define EVENT_TOUCHPAD_RAW_XY 0x00
#define TOUCHPAD_RAW_XY_ORIGIN_LOWER_LEFT 0x01
#define TOUCHPAD_RAW_XY_ORIGIN_UPPER_LEFT 0x03
struct hidpp_touchpad_raw_info {
u16 x_size;
u16 y_size;
u8 z_range;
u8 area_range;
u8 timestamp_unit;
u8 maxcontacts;
u8 origin;
u16 res;
};
struct hidpp_touchpad_raw_xy_finger {
u8 contact_type;
u8 contact_status;
u16 x;
u16 y;
u8 z;
u8 area;
u8 finger_id;
};
struct hidpp_touchpad_raw_xy {
u16 timestamp;
struct hidpp_touchpad_raw_xy_finger fingers[2];
u8 spurious_flag;
u8 end_of_frame;
u8 finger_count;
u8 button;
};
static int hidpp_touchpad_get_raw_info(struct hidpp_device *hidpp,
u8 feature_index, struct hidpp_touchpad_raw_info *raw_info)
{
struct hidpp_report response;
int ret;
u8 *params = (u8 *)response.fap.params;
ret = hidpp_send_fap_command_sync(hidpp, feature_index,
CMD_TOUCHPAD_GET_RAW_INFO, NULL, 0, &response);
if (ret > 0) {
hid_err(hidpp->hid_dev, "%s: received protocol error 0x%02x\n",
__func__, ret);
return -EPROTO;
}
if (ret)
return ret;
raw_info->x_size = get_unaligned_be16(¶ms[0]);
raw_info->y_size = get_unaligned_be16(¶ms[2]);
raw_info->z_range = params[4];
raw_info->area_range = params[5];
raw_info->maxcontacts = params[7];
raw_info->origin = params[8];
/* res is given in unit per inch */
raw_info->res = get_unaligned_be16(¶ms[13]) * 2 / 51;
return ret;
}
static int hidpp_touchpad_set_raw_report_state(struct hidpp_device *hidpp_dev,
u8 feature_index, bool send_raw_reports,
bool sensor_enhanced_settings)
{
struct hidpp_report response;
/*
* Params:
* bit 0 - enable raw
* bit 1 - 16bit Z, no area
* bit 2 - enhanced sensitivity
* bit 3 - width, height (4 bits each) instead of area
* bit 4 - send raw + gestures (degrades smoothness)
* remaining bits - reserved
*/
u8 params = send_raw_reports | (sensor_enhanced_settings << 2);
return hidpp_send_fap_command_sync(hidpp_dev, feature_index,
CMD_TOUCHPAD_SET_RAW_REPORT_STATE, ¶ms, 1, &response);
}
static void hidpp_touchpad_touch_event(u8 *data,
struct hidpp_touchpad_raw_xy_finger *finger)
{
u8 x_m = data[0] << 2;
u8 y_m = data[2] << 2;
finger->x = x_m << 6 | data[1];
finger->y = y_m << 6 | data[3];
finger->contact_type = data[0] >> 6;
finger->contact_status = data[2] >> 6;
finger->z = data[4];
finger->area = data[5];
finger->finger_id = data[6] >> 4;
}
static void hidpp_touchpad_raw_xy_event(struct hidpp_device *hidpp_dev,
u8 *data, struct hidpp_touchpad_raw_xy *raw_xy)
{
memset(raw_xy, 0, sizeof(struct hidpp_touchpad_raw_xy));
raw_xy->end_of_frame = data[8] & 0x01;
raw_xy->spurious_flag = (data[8] >> 1) & 0x01;
raw_xy->finger_count = data[15] & 0x0f;
raw_xy->button = (data[8] >> 2) & 0x01;
if (raw_xy->finger_count) {
hidpp_touchpad_touch_event(&data[2], &raw_xy->fingers[0]);
hidpp_touchpad_touch_event(&data[9], &raw_xy->fingers[1]);
}
}
/* -------------------------------------------------------------------------- */
/* 0x8123: Force feedback support */
/* -------------------------------------------------------------------------- */
#define HIDPP_FF_GET_INFO 0x01
#define HIDPP_FF_RESET_ALL 0x11
#define HIDPP_FF_DOWNLOAD_EFFECT 0x21
#define HIDPP_FF_SET_EFFECT_STATE 0x31
#define HIDPP_FF_DESTROY_EFFECT 0x41
#define HIDPP_FF_GET_APERTURE 0x51
#define HIDPP_FF_SET_APERTURE 0x61
#define HIDPP_FF_GET_GLOBAL_GAINS 0x71
#define HIDPP_FF_SET_GLOBAL_GAINS 0x81
#define HIDPP_FF_EFFECT_STATE_GET 0x00
#define HIDPP_FF_EFFECT_STATE_STOP 0x01
#define HIDPP_FF_EFFECT_STATE_PLAY 0x02
#define HIDPP_FF_EFFECT_STATE_PAUSE 0x03
#define HIDPP_FF_EFFECT_CONSTANT 0x00
#define HIDPP_FF_EFFECT_PERIODIC_SINE 0x01
#define HIDPP_FF_EFFECT_PERIODIC_SQUARE 0x02
#define HIDPP_FF_EFFECT_PERIODIC_TRIANGLE 0x03
#define HIDPP_FF_EFFECT_PERIODIC_SAWTOOTHUP 0x04
#define HIDPP_FF_EFFECT_PERIODIC_SAWTOOTHDOWN 0x05
#define HIDPP_FF_EFFECT_SPRING 0x06
#define HIDPP_FF_EFFECT_DAMPER 0x07
#define HIDPP_FF_EFFECT_FRICTION 0x08
#define HIDPP_FF_EFFECT_INERTIA 0x09
#define HIDPP_FF_EFFECT_RAMP 0x0A
#define HIDPP_FF_EFFECT_AUTOSTART 0x80
#define HIDPP_FF_EFFECTID_NONE -1
#define HIDPP_FF_EFFECTID_AUTOCENTER -2
#define HIDPP_FF_MAX_PARAMS 20
#define HIDPP_FF_RESERVED_SLOTS 1
struct hidpp_ff_private_data {
struct hidpp_device *hidpp;
u8 feature_index;
u8 version;
u16 gain;
s16 range;
u8 slot_autocenter;
u8 num_effects;
int *effect_ids;
struct workqueue_struct *wq;
atomic_t workqueue_size;
};
struct hidpp_ff_work_data {
struct work_struct work;
struct hidpp_ff_private_data *data;
int effect_id;
u8 command;
u8 params[HIDPP_FF_MAX_PARAMS];
u8 size;
};
static const signed short hiddpp_ff_effects[] = {
FF_CONSTANT,
FF_PERIODIC,
FF_SINE,
FF_SQUARE,
FF_SAW_UP,
FF_SAW_DOWN,
FF_TRIANGLE,
FF_SPRING,
FF_DAMPER,
FF_AUTOCENTER,
FF_GAIN,
-1
};
static const signed short hiddpp_ff_effects_v2[] = {
FF_RAMP,
FF_FRICTION,
FF_INERTIA,
-1
};
static const u8 HIDPP_FF_CONDITION_CMDS[] = {
HIDPP_FF_EFFECT_SPRING,
HIDPP_FF_EFFECT_FRICTION,
HIDPP_FF_EFFECT_DAMPER,
HIDPP_FF_EFFECT_INERTIA
};
static const char *HIDPP_FF_CONDITION_NAMES[] = {
"spring",
"friction",
"damper",
"inertia"
};
static u8 hidpp_ff_find_effect(struct hidpp_ff_private_data *data, int effect_id)
{
int i;
for (i = 0; i < data->num_effects; i++)
if (data->effect_ids[i] == effect_id)
return i+1;
return 0;
}
static void hidpp_ff_work_handler(struct work_struct *w)
{
struct hidpp_ff_work_data *wd = container_of(w, struct hidpp_ff_work_data, work);
struct hidpp_ff_private_data *data = wd->data;
struct hidpp_report response;
u8 slot;
int ret;
/* add slot number if needed */
switch (wd->effect_id) {
case HIDPP_FF_EFFECTID_AUTOCENTER:
wd->params[0] = data->slot_autocenter;
break;
case HIDPP_FF_EFFECTID_NONE:
/* leave slot as zero */
break;
default:
/* find current slot for effect */
wd->params[0] = hidpp_ff_find_effect(data, wd->effect_id);
break;
}
/* send command and wait for reply */
ret = hidpp_send_fap_command_sync(data->hidpp, data->feature_index,
wd->command, wd->params, wd->size, &response);
if (ret) {
hid_err(data->hidpp->hid_dev, "Failed to send command to device!\n");
goto out;
}
/* parse return data */
switch (wd->command) {
case HIDPP_FF_DOWNLOAD_EFFECT:
slot = response.fap.params[0];
if (slot > 0 && slot <= data->num_effects) {
if (wd->effect_id >= 0)
/* regular effect uploaded */
data->effect_ids[slot-1] = wd->effect_id;
else if (wd->effect_id >= HIDPP_FF_EFFECTID_AUTOCENTER)
/* autocenter spring uploaded */
data->slot_autocenter = slot;
}
break;
case HIDPP_FF_DESTROY_EFFECT:
if (wd->effect_id >= 0)
/* regular effect destroyed */
data->effect_ids[wd->params[0]-1] = -1;
else if (wd->effect_id >= HIDPP_FF_EFFECTID_AUTOCENTER)
/* autocenter spring destoyed */
data->slot_autocenter = 0;
break;
case HIDPP_FF_SET_GLOBAL_GAINS:
data->gain = (wd->params[0] << 8) + wd->params[1];
break;
case HIDPP_FF_SET_APERTURE:
data->range = (wd->params[0] << 8) + wd->params[1];
break;
default:
/* no action needed */
break;
}
out:
atomic_dec(&data->workqueue_size);
kfree(wd);
}
static int hidpp_ff_queue_work(struct hidpp_ff_private_data *data, int effect_id, u8 command, u8 *params, u8 size)
{
struct hidpp_ff_work_data *wd = kzalloc(sizeof(*wd), GFP_KERNEL);
int s;
if (!wd)
return -ENOMEM;
INIT_WORK(&wd->work, hidpp_ff_work_handler);
wd->data = data;
wd->effect_id = effect_id;
wd->command = command;
wd->size = size;
memcpy(wd->params, params, size);
atomic_inc(&data->workqueue_size);
queue_work(data->wq, &wd->work);
/* warn about excessive queue size */
s = atomic_read(&data->workqueue_size);
if (s >= 20 && s % 20 == 0)
hid_warn(data->hidpp->hid_dev, "Force feedback command queue contains %d commands, causing substantial delays!", s);
return 0;
}
static int hidpp_ff_upload_effect(struct input_dev *dev, struct ff_effect *effect, struct ff_effect *old)
{
struct hidpp_ff_private_data *data = dev->ff->private;
u8 params[20];
u8 size;
int force;
/* set common parameters */
params[2] = effect->replay.length >> 8;
params[3] = effect->replay.length & 255;
params[4] = effect->replay.delay >> 8;
params[5] = effect->replay.delay & 255;
switch (effect->type) {
case FF_CONSTANT: